The microblog: 2016.01.18 16:52:22

2016.01.18 16:52:22 (689113109060038661) from Daniel J. Bernstein:

Salesman offering your company "unbreakable Quantum Key Distribution"? Show him, and post his response for scrutiny.

2016.01.18 17:01:48 (689115480267816960) from Daniel J. Bernstein:

If QKD security is "guaranteed by the laws of quantum physics" ( then Vadim Makarov transcends the laws of physics!

2016.01.18 17:20:35 (689120207210696704) from Daniel J. Bernstein:

Part of what's going on here is bait-and-switch. "QKD" can mean (1) a "provably secure" fantasy; (2) the snake oil being sold commercially.

2016.01.18 17:22:45 (689120752981921792) from Daniel J. Bernstein:

But there's an even more fundamental problem: the independence hypotheses in the "security proof" are inconsistent with the laws of physics.

2016.01.18 17:55:20 (689128951864766465) from Daniel J. Bernstein:

Pure fantasy QKD assumes that some Alice+Bob actions are independent of Eve. But that's simply false. Can't avoid radio waves, gravity, etc.

2016.01.18 23:15:38 (689209557944561664) from Daniel J. Bernstein:

Holographic principle says, roughly, that secrets are stolen at cost cd^n by an attacker at distance d. The (c,n) for QKD seem horribly low.

2016.01.18 23:24:04 (689211679943593988) from Daniel J. Bernstein:

Typical QKD marketing claim: All secret keys are guessable "eventually". Consensus of actual physicists: All physical computations are O(1).